Module: Upslope Area
(c) 2001 by O.Conrad
Menu: Terrain Analysis > Hydrology > Catchment Area
Description
This module allows you to specify target cells, for which the upslope contributing area shall be identified. The result will give for each cell the percentage of its flow that reaches the target cell(s).

References:

Deterministic 8
- O'Callaghan, J.F. / Mark, D.M. (1984):
'The extraction of drainage networks from digital elevation data',
Computer Vision, Graphics and Image Processing, 28:323-344

Deterministic Infinity:
- Tarboton, D.G. (1997):
'A new method for the determination of flow directions and upslope areas in grid digital elevation models',
Water Ressources Research, Vol.33, No.2, p.309-319

Multiple Flow Direction:
- Freeman, G.T. (1991):
'Calculating catchment area with divergent flow based on a regular grid',
Computers and Geosciences, 17:413-22

- Quinn, P.F. / Beven, K.J. / Chevallier, P. / Planchon, O. (1991):
'The prediction of hillslope flow paths for distributed hydrological modelling using digital terrain models',
Hydrological Processes, 5:59-79

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This version uses all valid cells (not 'no data' values) of given target grid to determine the contributing area.
Parameters
NameTypeIdentifierDescriptionConstraints
Input
Target Area Grid (input)TARGET
Elevation Grid (input)ELEVATION
Sink Routes (*)Grid (optional input)SINKROUTE
Output
Upslope AreaGrid (output)AREA
Options
MethodChoiceMETHODAvailable Choices:
[0] Deterministic 8
[1] Deterministic Infinity
[2] Multiple Flow Direction
ConvergenceFloating pointCONVERGEConvergence factor for Multiple Flow Direction algorithmMinimum: 0.001000
(*) optional